Happiness and treaties

[Q]

As you all know treaties affect the happiness of your population according to the happiness type you chose in the game setting. If you have peaceful type your population gets angry about wars and happy about trade-partnership treaties. If you have bloodthirsty it's just the opposite and neutral get angry about all treaties. This affects the population of the entire empire and you don't get any message about it! So if you are not careful you may end up with almost all colonies suddenly rioting.
Now for the treaties of trade alliance to partnership it seems no matter if you propose the treaty or accept it. It affects both empires. This seems not to be the case for the war declaration. You may declare war without change of the happiness in your population. But if you receive war declarations it influences the happiness. For bloodthirsty races it is therefore much better, that they don't declare war themselfes but let other empires declare war on them!